Suburito
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A suburito is a bokken possessing significantly greater size and weight than that of a typical bokken; as such, it is used for practicing Suburi (sword swinging) and solo katas only, and is not intended for use in bokken-on-bokken combat (although, as it has similar construction, it could still be used for that purpose). Its main purpose is to perfect Hasuji (edge-angle) and Tomei (ability to stop the sword). It is usually used to practice with Tanrenuchi.
Its weight and balance, rather than its dimensions, are better to simulate that of katana, as opposed to a bokken whose dimensions better simulate that of a katana.
A common misconception among people unfamiliar with the suburito is that it is connected to nodachi training, due to its similar size/shape. Although its usefulness in that capacity could be argued, it was never intended for such training purposes.